Rubio blasts Trump's plan to form 'cyber security unit' with Putin

Marco Rubio is not on board with President Trump's plan to partner with Russian President Vladimir Putin to form a Cyber Security Unit.

The Florida senator's reaction came after Trump tweeted, "Putin and I discussed forming an impenetrable Cyber Security Unit so that election hacking and many other negative things will be guarded."

Calling out Putin and his "oppression, war crimes & interference in our elections," Rubio expressed his concern in a series of tweets.

Click through images from Trump's meeting with Putin:

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Vladimir Putin and Donald Trump meet at G20

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Vladimir Putin and Donald Trump meet at G20

US President Donald Trump and Russia's President Vladimir Putin shake hands during a meeting on the sidelines of the G20 Summit in Hamburg, Germany, on July 7, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Leaders Donald Trump and Vladimir Putin meet at the G-20 in Hamburg.

(Image: Reuters video)

US President Donald Trump and Russia's President Vladimir Putin hold a meeting on the sidelines of the G20 Summit in Hamburg, Germany, on July 7, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Leaders Donald Trump and Vladimir Putin meet at the G-20 in Hamburg.

(Image: Reuters video)

HAMBURG, GERMANY - JULY 7, 2017: Melania Trump (L), First Lady of the United States, and Russia's President Vladimir Putin shake hands as they meet on the sidelines of a G20 summit. Mikhail Klimentyev/Russian Presidential Press and Information Office/TASS (Photo by Mikhail Klimentyev\TASS via Getty Images)

HAMBURG, GERMANY - JULY 07: In this photo provided by the German Government Press Office (BPA), Donald Trump, President of the USA (C) meets Vladimir Putin, President of Russia and President of the EU Commission Jean-Claude Juncker (L) during the G20 Summit on July 7, 2017 in Hamburg, Germany. The G20 group of nations are meeting July 7-8 and major topics will include climate change and migration. (Photo by BPA via Getty Images)

HAMBURG, GERMANY - JULY 07: In this photo provided by the German Government Press Office (BPA) Donald Trump, President of the USA (left), meets Vladimir Putin, President of Russia (right), at the opening of the G20 summit on July 7, 2017 in Hamburg, Germany. The G20 group of nations are meeting July 7-8 and major topics will include climate change and migration. (Photo by Steffen Kugler /BPA via Getty Images)

HAMBURG, GERMANY - JULY 07: International leaders attend the group photo on the first day of the G20 economic summit on July 7, 2017 in Hamburg, Germany. The G20 group of nations are meeting July 7-8 and major topics will include climate change and migration. (Photo by Sean Gallup/Getty Images)

HAMBURG, GERMANY - JULY 07: Russian President Vladimir Putin (L) talks to the US first lady Melania Trump (R) as they attend a state banquet in the Elbphilarmonie concert Hall on the first day of the G20 economic summit on July 7, 2017 in Hamburg, Germany. The G20 group of nations are meeting July 7-8 and major topics will include climate change and migration. . (Photo by Felipe Trueba - Pool / Getty Images)

HAMBURG, GERMANY - JULY 07: World leaders pose for a family photo during the G20 summit on July 7, 2017 in Hamburg, Germany. Leaders of the G20 group of nations are meeting for the July 7-8 summit. Topics high on the agenda for the summit include climate policy and development programs for African economies. (Photo by Matt Cardy/Getty Images)

Russia's President Vladimir Putin talks to U.S. President Donald Trump during their bilateral meeting at the G20 summit in Hamburg, Germany July 7, 2017. REUTERS/Carlos Barria

US President Donald Trump (R) and Russia's President Vladimir Putin shake hands during a meeting on the sidelines of the G20 Summit in Hamburg, Germany, on July 7, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US President Donald Trump and Russia's President Vladimir Putin hold a meeting on the sidelines of the G20 Summit in Hamburg, Germany, on July 7, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

Russia's President Vladimir Putin talks to Melania Trump during the official dinner at the Elbphilharmonie Concert Hall during the G20 summit in Hamburg, Germany July 7, 2017. REUTERS/Kay Nietfeld,Pool

US President Donald Trump and Russia's President Vladimir Putin hold a meeting on the sidelines of the G20 Summit in Hamburg, Germany, on July 7, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US President Donald Trump (C-R) and Russia's President Vladimir Putin (C-L) hold a meeting on the sidelines of the G20 Summit in Hamburg, Germany, on July 7, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US President Donald Trump (R) and Russia's President Vladimir Putin shake hands during a meeting on the sidelines of the G20 Summit in Hamburg, Germany, on July 7, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

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He wrote, "While reality & pragmatism requires that we engage Vladimir Putin, he will never be a trusted ally or a reliable constructive partner."

Partnering with Putin on a 'Cyber Security Unit' is akin to partnering with Assad on a 'Chemical Weapons Unit," Rubio continued.

Trump said on Twitter the G20 Summit was a great success for the U.S. and that he pressed Putin about Russian interference in the 2016 election, saying the Russian president "vehemently denied" it.